From the following data determine Karl Pearson's coefficient of correlation between X and Y series for 15 pairs.
X SERIES :
Mean = 80
Sum of squares of deviation from A.M. = 56
Sum of product of deviations of X and Y from their respective Means = 92
Y SERIES :
Mean = 120
Sum of squares of deviation from A.M. = 156
Sum of product of deviations of X and Y from their respective Means = 92